[RTTY] TinyFSK modem for 45 and 75 baud

[Kok Chen]

On Oct 10, 2013, at 5:54 PM, Jim W7RY wrote:

> The Nano that I'm looking at has different pin numbers for the functions listed on the page below.

The current Arduino Nano from Italy, and two Chinese knockoffs that I know of, have the same pin outs as the schematics in Andy's document. 

The Nano's RX pin is also Data pin 0 (D0) and its TX pin is also Data pin 1 (D1) and they may be labeled as D0RX and D1TX.  But it shouldn't matter since Andy did not use those two pins (the FTDI chip needs it :-).  (I think there is a typo in Andy's schematics showing the RX pin as RX1 instead of RX0 -- I had missed that when Andy asked me to proofread the manuscript, HI HI.  Blame it on me.)

The Arduino Micro has almost the same form factor as the Nano, but with 2 extra pins.   It is often mistaken for the Arduino Nano.

If you already have the Micro instead of the Nano, and if your OS enumerates USB CDC devices as landline serial modems, you might be able to coax your software to use an Arduino Micro instead of Arduino Nano.  On Mac OS X, a USB CDC device appears in the same enumeration as USB serial ports, and I have been using USB CDC and USB serial port interchangeably.

The "Arduino Nano v3.00 by Arduino" that is on Amazon's web site is not a real Arduino, by the way, but a knock off by iTead Studio of China; they had ripped off even the "Arduiino" name, but not the Arduino logo.  But that one too has the same pin outs as the real Arduino Nano .

The real Arduino Nano is here (you can see the D0RX and D1TX pins in the photo):

http://arduino.cc/en/Main/ArduinoBoardNano

73
Chen, W7AY